Huge advances in DNA sequencing mean the whole genome of a bacterium can be worked out in a day for around £120.

The researchers are about to start a trial investigating the cost-effectiveness of introducing genomic detective-work into the NHS.

Dr Jonathan Pearce, the head of infections and immunity at the UK’s Medical Research Council, said: “This study sheds light on MRSA transmission within and between hospitals and the community, which could help strengthen infection prevention and control measures.”